Our NSL8200B Premium Strap Locks ensure your guitar will never unexpectedly pop out of its strap again. This pair of strap locks replaces the standard strap buttons on a guitar with a secure locking system that keeps the strap attached regardless of your movements or your guitar's position. A simple compress-and-release action enables efficient connection and removal of the strap. For this model, an ergonomic wingnut replaces the standard hex nut that fastens the pull knob to the strap. The included wrench tightens the wingnut and doubles as a bottle opener.